[Gmsh] problem to switch normal orientation in .mesh file format

[NENNIG Benoit]

Dear gmsh users,

I observed that putting a minus sign in the physical surface definition,
ex :    Physical Surface(1) = {-6}; 
useful to switch the normal orientation doesn't switch the normal orientation if the export is done in .mesh file format and leads to negative label in the .mesh file
...
 Triangles
 40
 12 13 50 -1
 13 14 50 -1
...
everithing is find in .msh. Please find in attachment a simple example with the geo, msh and mesh file.

Best regards,

Benoit
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